[testsuite/guality] Prevent optimization of local in vla-1.c

2018-07-01  Tom de Vries  <tdevries@suse.de>

	* gcc.dg/guality/prevent-optimization.h (VOLATILE): Define.
	* gcc.dg/guality/vla-1.c (f1): Mark local vla a as VOLATILE.

From-SVN: r262287

gcc/testsuite/ChangeLog

 2018-07-01  Tom de Vries  <tdevries@suse.de>
 
+	* gcc.dg/guality/prevent-optimization.h (VOLATILE): Define.
+	* gcc.dg/guality/vla-1.c (f1): Mark local vla a as VOLATILE.
+
+2018-07-01  Tom de Vries  <tdevries@suse.de>
+
 	* lib/gcc-dg.exp (get-absolute-line): Handle '.'.
 	* gcc.dg/guality/vla-1.c: Use relative line numbers.
 

gcc/testsuite/gcc.dg/guality/prevent-optimization.h

@@ -21,8 +21,10 @@ along with GCC; see the file COPYING3.  If not see
 
 #ifdef PREVENT_OPTIMIZATION
 #define ATTRIBUTE_USED __attribute__((used))
+#define VOLATILE volatile
 #else
 #define ATTRIBUTE_USED
+#define VOLATILE
 #endif
 
 #endif

gcc/testsuite/gcc.dg/guality/vla-1.c

@@ -2,6 +2,8 @@
 /* { dg-do run } */
 /* { dg-options "-g" } */
 
+#include "prevent-optimization.h"
+
 void __attribute__((noinline))
 bar (short *p)
 {
@@ -12,7 +14,7 @@ bar (short *p)
 int __attribute__((noinline))
 f1 (int i)
 {
-  char a[i + 1];
+  VOLATILE char a[i + 1];
   a[0] = 5;		/* { dg-final { gdb-test .+1 "i" "5" } } */
   return a[0];		/* { dg-final { gdb-test . "sizeof (a)" "6" } } */
 }